Let's roll up our sleeves and solve this. We have 664 and we're going to multiply it by 235, essentially adding 664 to itself 235 times.
Step 1: 0 + 664 = 664
Step 2: 664 + 664 = 1328
Step 3: 1328 + 664 = 1992
Step 4: 1992 + 664 = 2656
Step 5: 2656 + 664 = 3320
Step 6: 3320 + 664 = 3984
Step 7: 3984 + 664 = 4648
Step 8: 4648 + 664 = 5312
Step 9: 5312 + 664 = 5976
Step 10: 5976 + 664 = 6640
Step 11: 6640 + 664 = 7304
Step 12: 7304 + 664 = 7968
Step 13: 7968 + 664 = 8632
Step 14: 8632 + 664 = 9296
Step 15: 9296 + 664 = 9960
Step 16: 9960 + 664 = 10624
Step 17: 10624 + 664 = 11288
Step 18: 11288 + 664 = 11952
Step 19: 11952 + 664 = 12616
Step 20: 12616 + 664 = 13280
Step 21: 13280 + 664 = 13944
Step 22: 13944 + 664 = 14608
Step 23: 14608 + 664 = 15272
Step 24: 15272 + 664 = 15936
Step 25: 15936 + 664 = 16600
Step 26: 16600 + 664 = 17264
Step 27: 17264 + 664 = 17928
Step 28: 17928 + 664 = 18592
Step 29: 18592 + 664 = 19256
Step 30: 19256 + 664 = 19920
Step 31: 19920 + 664 = 20584
Step 32: 20584 + 664 = 21248
Step 33: 21248 + 664 = 21912
Step 34: 21912 + 664 = 22576
Step 35: 22576 + 664 = 23240
Step 36: 23240 + 664 = 23904
Step 37: 23904 + 664 = 24568
Step 38: 24568 + 664 = 25232
Step 39: 25232 + 664 = 25896
Step 40: 25896 + 664 = 26560
Step 41: 26560 + 664 = 27224
Step 42: 27224 + 664 = 27888
Step 43: 27888 + 664 = 28552
Step 44: 28552 + 664 = 29216
Step 45: 29216 + 664 = 29880
Step 46: 29880 + 664 = 30544
Step 47: 30544 + 664 = 31208
Step 48: 31208 + 664 = 31872
Step 49: 31872 + 664 = 32536
Step 50: 32536 + 664 = 33200
Step 51: 33200 + 664 = 33864
Step 52: 33864 + 664 = 34528
Step 53: 34528 + 664 = 35192
Step 54: 35192 + 664 = 35856
Step 55: 35856 + 664 = 36520
Step 56: 36520 + 664 = 37184
Step 57: 37184 + 664 = 37848
Step 58: 37848 + 664 = 38512
Step 59: 38512 + 664 = 39176
Step 60: 39176 + 664 = 39840
Step 61: 39840 + 664 = 40504
Step 62: 40504 + 664 = 41168
Step 63: 41168 + 664 = 41832
Step 64: 41832 + 664 = 42496
Step 65: 42496 + 664 = 43160
Step 66: 43160 + 664 = 43824
Step 67: 43824 + 664 = 44488
Step 68: 44488 + 664 = 45152
Step 69: 45152 + 664 = 45816
Step 70: 45816 + 664 = 46480
Step 71: 46480 + 664 = 47144
Step 72: 47144 + 664 = 47808
Step 73: 47808 + 664 = 48472
Step 74: 48472 + 664 = 49136
Step 75: 49136 + 664 = 49800
Step 76: 49800 + 664 = 50464
Step 77: 50464 + 664 = 51128
Step 78: 51128 + 664 = 51792
Step 79: 51792 + 664 = 52456
Step 80: 52456 + 664 = 53120
Step 81: 53120 + 664 = 53784
Step 82: 53784 + 664 = 54448
Step 83: 54448 + 664 = 55112
Step 84: 55112 + 664 = 55776
Step 85: 55776 + 664 = 56440
Step 86: 56440 + 664 = 57104
Step 87: 57104 + 664 = 57768
Step 88: 57768 + 664 = 58432
Step 89: 58432 + 664 = 59096
Step 90: 59096 + 664 = 59760
Step 91: 59760 + 664 = 60424
Step 92: 60424 + 664 = 61088
Step 93: 61088 + 664 = 61752
Step 94: 61752 + 664 = 62416
Step 95: 62416 + 664 = 63080
Step 96: 63080 + 664 = 63744
Step 97: 63744 + 664 = 64408
Step 98: 64408 + 664 = 65072
Step 99: 65072 + 664 = 65736
Step 100: 65736 + 664 = 66400
Step 101: 66400 + 664 = 67064
Step 102: 67064 + 664 = 67728
Step 103: 67728 + 664 = 68392
Step 104: 68392 + 664 = 69056
Step 105: 69056 + 664 = 69720
Step 106: 69720 + 664 = 70384
Step 107: 70384 + 664 = 71048
Step 108: 71048 + 664 = 71712
Step 109: 71712 + 664 = 72376
Step 110: 72376 + 664 = 73040
Step 111: 73040 + 664 = 73704
Step 112: 73704 + 664 = 74368
Step 113: 74368 + 664 = 75032
Step 114: 75032 + 664 = 75696
Step 115: 75696 + 664 = 76360
Step 116: 76360 + 664 = 77024
Step 117: 77024 + 664 = 77688
Step 118: 77688 + 664 = 78352
Step 119: 78352 + 664 = 79016
Step 120: 79016 + 664 = 79680
Step 121: 79680 + 664 = 80344
Step 122: 80344 + 664 = 81008
Step 123: 81008 + 664 = 81672
Step 124: 81672 + 664 = 82336
Step 125: 82336 + 664 = 83000
Step 126: 83000 + 664 = 83664
Step 127: 83664 + 664 = 84328
Step 128: 84328 + 664 = 84992
Step 129: 84992 + 664 = 85656
Step 130: 85656 + 664 = 86320
Step 131: 86320 + 664 = 86984
Step 132: 86984 + 664 = 87648
Step 133: 87648 + 664 = 88312
Step 134: 88312 + 664 = 88976
Step 135: 88976 + 664 = 89640
Step 136: 89640 + 664 = 90304
Step 137: 90304 + 664 = 90968
Step 138: 90968 + 664 = 91632
Step 139: 91632 + 664 = 92296
Step 140: 92296 + 664 = 92960
Step 141: 92960 + 664 = 93624
Step 142: 93624 + 664 = 94288
Step 143: 94288 + 664 = 94952
Step 144: 94952 + 664 = 95616
Step 145: 95616 + 664 = 96280
Step 146: 96280 + 664 = 96944
Step 147: 96944 + 664 = 97608
Step 148: 97608 + 664 = 98272
Step 149: 98272 + 664 = 98936
Step 150: 98936 + 664 = 99600
Step 151: 99600 + 664 = 100264
Step 152: 100264 + 664 = 100928
Step 153: 100928 + 664 = 101592
Step 154: 101592 + 664 = 102256
Step 155: 102256 + 664 = 102920
Step 156: 102920 + 664 = 103584
Step 157: 103584 + 664 = 104248
Step 158: 104248 + 664 = 104912
Step 159: 104912 + 664 = 105576
Step 160: 105576 + 664 = 106240
Step 161: 106240 + 664 = 106904
Step 162: 106904 + 664 = 107568
Step 163: 107568 + 664 = 108232
Step 164: 108232 + 664 = 108896
Step 165: 108896 + 664 = 109560
Step 166: 109560 + 664 = 110224
Step 167: 110224 + 664 = 110888
Step 168: 110888 + 664 = 111552
Step 169: 111552 + 664 = 112216
Step 170: 112216 + 664 = 112880
Step 171: 112880 + 664 = 113544
Step 172: 113544 + 664 = 114208
Step 173: 114208 + 664 = 114872
Step 174: 114872 + 664 = 115536
Step 175: 115536 + 664 = 116200
Step 176: 116200 + 664 = 116864
Step 177: 116864 + 664 = 117528
Step 178: 117528 + 664 = 118192
Step 179: 118192 + 664 = 118856
Step 180: 118856 + 664 = 119520
Step 181: 119520 + 664 = 120184
Step 182: 120184 + 664 = 120848
Step 183: 120848 + 664 = 121512
Step 184: 121512 + 664 = 122176
Step 185: 122176 + 664 = 122840
Step 186: 122840 + 664 = 123504
Step 187: 123504 + 664 = 124168
Step 188: 124168 + 664 = 124832
Step 189: 124832 + 664 = 125496
Step 190: 125496 + 664 = 126160
Step 191: 126160 + 664 = 126824
Step 192: 126824 + 664 = 127488
Step 193: 127488 + 664 = 128152
Step 194: 128152 + 664 = 128816
Step 195: 128816 + 664 = 129480
Step 196: 129480 + 664 = 130144
Step 197: 130144 + 664 = 130808
Step 198: 130808 + 664 = 131472
Step 199: 131472 + 664 = 132136
Step 200: 132136 + 664 = 132800
Step 201: 132800 + 664 = 133464
Step 202: 133464 + 664 = 134128
Step 203: 134128 + 664 = 134792
Step 204: 134792 + 664 = 135456
Step 205: 135456 + 664 = 136120
Step 206: 136120 + 664 = 136784
Step 207: 136784 + 664 = 137448
Step 208: 137448 + 664 = 138112
Step 209: 138112 + 664 = 138776
Step 210: 138776 + 664 = 139440
Step 211: 139440 + 664 = 140104
Step 212: 140104 + 664 = 140768
Step 213: 140768 + 664 = 141432
Step 214: 141432 + 664 = 142096
Step 215: 142096 + 664 = 142760
Step 216: 142760 + 664 = 143424
Step 217: 143424 + 664 = 144088
Step 218: 144088 + 664 = 144752
Step 219: 144752 + 664 = 145416
Step 220: 145416 + 664 = 146080
Step 221: 146080 + 664 = 146744
Step 222: 146744 + 664 = 147408
Step 223: 147408 + 664 = 148072
Step 224: 148072 + 664 = 148736
Step 225: 148736 + 664 = 149400
Step 226: 149400 + 664 = 150064
Step 227: 150064 + 664 = 150728
Step 228: 150728 + 664 = 151392
Step 229: 151392 + 664 = 152056
Step 230: 152056 + 664 = 152720
Step 231: 152720 + 664 = 153384
Step 232: 153384 + 664 = 154048
Step 233: 154048 + 664 = 154712
Step 234: 154712 + 664 = 155376
Step 235: 155376 + 664 = 156040

So, 664*235 = 156040